各位有用过F133 melis系统的g2d功能吗？我需要一个图片缩放的功能，软件缩放太慢，想用g2d功能加速一下。但是用不了。我的代码如下：
static int g2d_img_scale(char* src, int src_w, int src_h, char* dst, int dst_w, int dst_h)
{
int g2d_fd = open("/dev/g2d", O_RDWR);
if (g2d_fd < 0)
{
eLIBs_printf("g2d_img_effect1, open g2d failed, g2d_fd: %d\n", g2d_fd);
return -1;
}
eLIBs_printf("g2d_img_effect1, open g2d success, g2d_fd: %d\n", g2d_fd);

g2d_stretchblt *pstStchBlt = (g2d_stretchblt*)eLIBs_malloc(sizeof(*pstStchBlt));
if (!pstStchBlt)
{
    eLIBs_printf("g2d_img_effect1, malloc pstStchBlt failed, g2d_fd: %d\n", g2d_fd);
    close(g2d_fd);
    return -1;
}
eLIBs_memset(pstStchBlt, 0, sizeof(*pstStchBlt));

pstStchBlt->flag = G2D_BLT_NONE;
pstStchBlt->color = 0;
pstStchBlt->alpha = 0;
pstStchBlt->src_image.addr[0] = src;
pstStchBlt->src_image.format = G2D_FORMAT_ARGB8888;
pstStchBlt->src_image.w = src_w;
pstStchBlt->src_image.h = src_h;
pstStchBlt->src_image.pixel_seq = G2D_SEQ_NORMAL;
pstStchBlt->src_rect.x = 0;
pstStchBlt->src_rect.y = 0;
pstStchBlt->src_rect.w = src_w;
pstStchBlt->src_rect.h = src_h;

pstStchBlt->dst_image.addr[0] = dst;
pstStchBlt->dst_image.format = G2D_FORMAT_ARGB8888;
pstStchBlt->dst_image.w = dst_w;
pstStchBlt->dst_image.h = dst_h;
pstStchBlt->dst_image.pixel_seq = G2D_SEQ_NORMAL;
pstStchBlt->dst_rect.x = 0;
pstStchBlt->dst_rect.y = 0;
pstStchBlt->dst_rect.w = dst_w;
pstStchBlt->dst_rect.h = dst_h;

int iRet = ioctl(g2d_fd, G2D_CMD_STRETCHBLT, pstStchBlt);
if (iRet != 0) {
    eLIBs_printf("do G2D_CMD_STRETCHBLT failed!iRet: %d\n", iRet);
    close(g2d_fd);
    eLIBs_free(pstStchBlt);
    return -1;
}
close(g2d_fd);
eLIBs_free(pstStchBlt);
return 0;

}
就是在ioctl(g2d_fd, G2D_CMD_STRETCHBLT, pstStchBlt);返回-1，不知道哪位老板用过，请教一下。